History of Terrane Assembly, Eastern New England

9418203温契地体组装和变质作用是大多数造山带中常见的事件，研究得较好的新英格兰造山带也不例外。然而，新英格兰西部和东部的构造变质历史有根本的不同。在西部，由于变质等值线不会被地体边界移位，地体在加载和变质作用之前或期间组装。另一方面，在新英格兰东南部，地体在组装前发生了变质，越来越多的证据表明，组装发生在阿勒格尼亚期。这一差异的更大意义尚不清楚，部分原因是新英格兰东部的数据差距很大。该项目涉及对这一数据缺口中的东部岩石构造地体进行热年代学研究，以确定在整个新英格兰东部的地体组装过程中是否发生了显著的后变质断层作用，以及造成这种模式的因素是什么。这些结果将有助于解开新英格兰变质作用和地体并置的时间，这应该对其他不太知名的造山带感兴趣。

9418203 Wintsch Terrane assembly and metamorphism are common events in most orogenic belts, and the well studied New England orogen is no exception. However, there is a fundamental difference in the tectono-metamorphic histories of western and eastern New England. In the west, terranes were assembled prior to, or during loading and metamorphism as metamorphic isograds are not displaced by terrane boundaries. In southeastern New England, on the other hand, the terranes were metamorphosed prior to assembly and evidence is mounting that find assembly occurred in the Alleghanian. The broarder significance of the difference is not clear, partly because of a large data gap in eastern New England. This project involves thermochronlogic study of eastern lithotectonic terranes in this data gap to determine if significant post-Metamorphic faulting occurred during the assembly of terranes in all of eastern New England, and what factors are responsible for the resulting pattern. Results will help unravel the timing of metamorphism and terrane juxtaposition for New England, which should be of interest in other, less well known, orogens.